package com.wdz.fifter;

import cn.hutool.log.Log;
import cn.hutool.log.LogFactory;
import com.wdz.annotations.ResponseResult;
import com.wdz.annotations.constant.ResponseResultAnn;
import com.wdz.http.Response;
import org.springframework.core.MethodParameter;
import org.springframework.http.MediaType;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.server.ServerHttpRequest;
import org.springframework.http.server.ServerHttpResponse;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;
import org.springframework.web.servlet.mvc.method.annotation.ResponseBodyAdvice;

import javax.servlet.http.HttpServletRequest;

@ControllerAdvice
public class ResponseResultHandler implements ResponseBodyAdvice<Object> {
    private static final Log log = LogFactory.get();

    //标记名称
    public final static String RESPONSE_RESULT_ANN = ResponseResultAnn.RESPONSE_RESULT_ANN;

    @Override
    public boolean supports(MethodParameter returnType, Class<? extends HttpMessageConverter<?>> converterType) {
        ServletRequestAttributes sra = ((ServletRequestAttributes)RequestContextHolder.getRequestAttributes());
        HttpServletRequest request = sra.getRequest();
        //判断请求是否有包装标记
        ResponseResult responseResult = (ResponseResult)request.getAttribute(RESPONSE_RESULT_ANN);
        return responseResult == null ? false:true;
    }

    @Override
    public Object beforeBodyWrite(Object body, MethodParameter returnType, MediaType selectedContentType, Class<? extends HttpMessageConverter<?>> selectedConverterType, ServerHttpRequest request, ServerHttpResponse response) {
        log.info("进入返回体 重写 中");
        //判断是否已经被封装（多半出于异常捕捉)
        if(!(body instanceof Response)){
            body = Response.success(body);
        }
        return body;
    }
}
